Record details

Title
    Shell morphology and palaeoecology of Praenatica gregaria Perner, 1903 from the Koněprusy Limestone (Lower Devonian) of Bohemia (Czech Republic)
Statement of responsibility
    Martin Jankovský
Author
    Jankovský, Martin
Language
    anglicky
Source title - serial
    Bulletin of geosciences
Vol./nr.
    Vol. 78, no. 4
Pages
    p. 423-429
Year
    2003
Notes
    1 obr., 2 diagr., 6 fot., 31 bibl.
    il.
    Zkr. název ser.: Bull. Geosci.
Subject group
    Barrandien
    barva
    Bryozoa
    devon-spodní
    distribuce četnosti
    epibiotismus
    Gastropoda
    poškození
    pražská pánev
    prostředí energeticky silné
    prostředí útesové
    schránky
Geographical name
    ČR-Čechy
    Měňany (Beroun)
Keyword
    1903
    Bohemia
    Czech
    Devonian
    Gregaria
    Koněprusy
    Limestone
    Lower
    Morphology
    Palaeoecology
    Perner
    Praenatica
    Republic
    Shell
Abstract (in english)
   Praenatica gregaria Perner, 1903 is an Early Devonian (Pragian) gastropod that is judged to be adapted to a stationary living habit on the tegmen of camerate crinoids. More than one thousand specimens were examined in order to describe and explain the occurrence of different morphological forms. The variability of the shells was found to be closely dependent on the attachment surface. Rapid growth changes during an ontogeny demonstrate the ability to move, perhaps even change hosts. Traces of colour patterns, epizoans in situ and repaired shell fractures were observed in some cases. The reconstructed colour pattern consists of longitudinal bands often transversally crossed by growth lines lacking pigment and probably serving a sheltering function. Various epizoans showed that the empty conch served as an appropriate base for the attachment of small and fragile organisms, most commonly bryozoan colonies. The majority of the studied shell fractures were formed passively in the surf.
   only some of them show evidence of the activity of molluscivorous predators
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    31. 3. 2008
Import date
    8. 8. 2012